function getType(o){  var _t;  return ((_t = typeof(o)) == "object" ? o==null && "null" || Object.prototype.toString.call(o).slice(8,-1):_t).toLowerCase();}function extend(destination,source){  for(var p in source){    if(getType(source[p])=="array"||getType(source[p])=="object"){      destination[p]=getType(source[p])=="array"?[]:{};      arguments.callee(destination[p],source[p]);    }else{      destination[p]=source[p];    }  }}var test={  a:"ss",  b:"dd",  c:[    {d:"css",e:"cdd"},    {      m:"ff",      n:[        {kk:"11",jj:"22"},        {ll:"44"}      ]    }  ]};var test1={};extend(test1,test);console.log(test);console.log(test1);test1.c[1].n[0].kk="change"; //改變test1的c屬性對象的d屬性console.log(test);console.log(test1);console.log(test.c[1].n[0]);console.log(test1.c[1].n[0]);